Question
Why are different colours observed in octahedral and tetrahedral complexes for the same metal and same ligands?
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Answer
The colour in coordination compounds is readily explained in terms of crystal field theory. It is noteworthy that in tetrahedral coordination entity formation, the d orbital splitting is inverted and is smaller as compared to the octahedral field splitting. So the d-d electrons transition energies differ. This holds good even when the complex is formed with same metal and same ligands and metal-ligand distances.
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